public class ByteArrayPriorityQueue extends AbstractBytePriorityQueue implements java.io.Serializable
Instances of this class represent a priority queue using a backing
array—all operations are performed directly on the array. The array is
enlarged as needed, but it is never shrunk. Use the trim()
method
to reduce its size, if necessary.
This implementation is extremely inefficient, but it is difficult to beat when the size of the queue is very small.
Constructor and Description |
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ByteArrayPriorityQueue()
Creates a new empty queue using the natural order.
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ByteArrayPriorityQueue(byte[] a)
Wraps a given array in a queue using the natural order.
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ByteArrayPriorityQueue(byte[] a,
ByteComparator c)
Wraps a given array in a queue using a given comparator.
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ByteArrayPriorityQueue(byte[] a,
int size)
Wraps a given array in a queue using the natural order.
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ByteArrayPriorityQueue(byte[] a,
int size,
ByteComparator c)
Wraps a given array in a queue using a given comparator.
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ByteArrayPriorityQueue(ByteComparator c)
Creates a new empty queue with a given comparator.
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ByteArrayPriorityQueue(int capacity)
Creates a new empty queue with a given capacity and using the natural order.
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ByteArrayPriorityQueue(int capacity,
ByteComparator c)
Creates a new empty queue with a given capacity and comparator.
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Modifier and Type | Method and Description |
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void |
changed()
Notifies the queue that the first element has changed (optional operation).
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void |
clear()
Removes all elements from this queue.
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ByteComparator |
comparator()
Returns the comparator associated with this sorted set, or null if it uses its elements' natural ordering.
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byte |
dequeueByte()
Dequeues the first element from the queue.
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void |
enqueue(byte x)
Enqueues a new element.
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byte |
firstByte()
Returns the first element of the queue.
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int |
size()
Returns the number of elements in this queue.
|
void |
trim()
Trims the underlying array so that it has exactly
size() elements. |
dequeue, enqueue, first, last, lastByte
isEmpty
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
isEmpty
public ByteArrayPriorityQueue(int capacity, ByteComparator c)
capacity
- the initial capacity of this queue.c
- the comparator used in this queue, or null
for the natural order.public ByteArrayPriorityQueue(int capacity)
capacity
- the initial capacity of this queue.public ByteArrayPriorityQueue(ByteComparator c)
c
- the comparator used in this queue, or null
for the natural order.public ByteArrayPriorityQueue()
public ByteArrayPriorityQueue(byte[] a, int size, ByteComparator c)
The queue returned by this method will be backed by the given array.
a
- an array.size
- the number of elements to be included in the queue.c
- the comparator used in this queue, or null
for the natural order.public ByteArrayPriorityQueue(byte[] a, ByteComparator c)
The queue returned by this method will be backed by the given array.
a
- an array.c
- the comparator used in this queue, or null
for the natural order.public ByteArrayPriorityQueue(byte[] a, int size)
The queue returned by this method will be backed by the given array.
a
- an array.size
- the number of elements to be included in the queue.public ByteArrayPriorityQueue(byte[] a)
The queue returned by this method will be backed by the given array.
a
- an array.public void enqueue(byte x)
BytePriorityQueue
enqueue
in interface BytePriorityQueue
x
- the element to enqueue.public byte dequeueByte()
BytePriorityQueue
dequeueByte
in interface BytePriorityQueue
public byte firstByte()
BytePriorityQueue
firstByte
in interface BytePriorityQueue
public void changed()
PriorityQueue
changed
in interface PriorityQueue<java.lang.Byte>
changed
in class AbstractPriorityQueue<java.lang.Byte>
public int size()
PriorityQueue
size
in interface PriorityQueue<java.lang.Byte>
public void clear()
PriorityQueue
clear
in interface PriorityQueue<java.lang.Byte>
public void trim()
size()
elements.public ByteComparator comparator()
BytePriorityQueue
Note that this specification strengthens the one given in PriorityQueue.comparator()
.
comparator
in interface BytePriorityQueue
comparator
in interface PriorityQueue<java.lang.Byte>
null
if it uses its elements' natural ordering.PriorityQueue.comparator()